Tyndall (pronounced TIN'-duhl) is a city in and the county seat of Bon Homme County, South Dakota, United States. The population was 1,067 at the 2010 census.
Tyndall was established in 1879 as the county seat of Bon Homme County. It was named for John Tyndall, an Irish physicist who had paid a visit to the United States.
Tyndall is located at 42°59′30″N 97°51′49″W. South Dakota Highway 50 serves the community and runs east-west on the southern end of town, and South Dakota Highway 37 is located just west of town.
According to the United States Census Bureau, the city has a total area of 1.58 square miles (4.09 km2), all land.
Tyndall has been assigned the ZIP code 57066 and the FIPS place code 64860.
As of the census of 2010, there were 1,067 people, 471 households, and 268 families living in the city. The population density was 675.3 inhabitants per square mile (260.7/km2). There were 531 housing units at an average density of 336.1 per square mile (129.8/km2). The racial makeup of the city was 97.9% White, 0.1% African American, 0.7% Native American, 0.6% from other races, and 0.7% from two or more races.